Intended for beginners in ergodic theory, this introductory textbook
addresses students as well as researchers in mathematical physics. The
main novelty is the systematic treatment of characteristic problems in
ergodic theory by a unified method in terms of convergent power series
and renormalization group methods, in particular. Basic concepts of
ergodicity, like Gibbs states, are developed and applied to, e.g.,
Asonov systems or KAM Theroy. Many examples illustrate the ideas and, in
addition, a substantial number of interesting topics are treated in the
form of guided problems.